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Investment Securities - Schedule of Unrealized Loss on Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | $ 261,855 | $ 860,016
12 Months or Longer | 536,586 | 47,163
Total | 798,441 | 907,179
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 2,856 | 11,778
12 Months or Longer | 7,553 | 531
Total | 10,409 | 12,309
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 33,975 | 134,909
12 Months or Longer | 45,498 | 7,564
Total | 79,473 | 142,473
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 232 | 5,148
12 Months or Longer | 519 | 87
Total | 751 | 5,235
Obligations of U.S. Treasury and other U.S. Government sponsored entities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 24,931 | 247,695
12 Months or Longer | 217,789 | 19,838
Total | 242,720 | 267,533
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 70 | 2,305
12 Months or Longer | 2,210 | 162
Total | 2,280 | 2,467
U.S. Government sponsored entity asset-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 236,924 | 612,321
12 Months or Longer | 318,797 | 27,325
Total | 555,721 | 639,646
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 2,786 | 9,473
12 Months or Longer | 5,343 | 369
Total | 8,129 | 9,842
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 7,331 |
12 Months or Longer |  | 7,564
Total | 7,331 | 7,564
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 38 |
12 Months or Longer |  | 87
Total | 38 | 87
Obligations of States and Political Subdivisions |  |
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 Months | 26,644 | 134,909
12 Months or Longer | 45,498 |
Total | 72,142 | 134,909
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract] |  |
Less than 12 Months | 194 | 5,148
12 Months or Longer | 519 |
Total | $ 713 | $ 5,148

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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